package com.komeri.komeriapl;

import java.util.Vector;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;

/**
 * このクラスは、捕獲のためのステートマシンを含み、すべてのメッセージングを処理する
 * @author Liu Mingjia
 */
public final class CaptureActivityHandler extends Handler {

  private static final String TAG = CaptureActivityHandler.class.getSimpleName();
  private final BaseCaptureActivity activity;
  private final DecodeThread decodeThread;
  private State state;

  private enum State {
    PREVIEW,
    SUCCESS,
    DONE
  }

  /**
   * @param activity
   * @param decodeFormats
   * @param characterSet
   * */
  public CaptureActivityHandler(BaseCaptureActivity activity, Vector<BarcodeFormat> decodeFormats,
          String characterSet) {
	  
      this.activity = activity;
    
      decodeThread = new DecodeThread(activity, decodeFormats, characterSet,
    		  new ViewfinderResultPointCallback(activity.getViewfinderView()));
    
      decodeThread.start();
    
      state = State.SUCCESS;
    
      // Start ourselves capturing previews and decoding.
      CameraManager.get().startPreview();
    
      restartPreviewAndDecode();
  }

  @Override
  public void handleMessage(Message message) {
    switch (message.what) {
      case R.id.auto_focus:
    	  // When one auto focus pass finishes, start another. This is the closest thing to
    	  // continuous AF. It does seem to hunt a bit, but I'm not sure what else to do.
          if (state == State.PREVIEW) {
              CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
          }
          break;
      case R.id.restart_preview:
    	  
	      restartPreviewAndDecode();
	      break;
	  //解析後のJANコード情報をバックして、画像はページに
      case R.id.decode_succeeded:

    	  state = State.SUCCESS;
          Bundle bundle = message.getData();
          Bitmap barcode = bundle == null ? null :
                  (Bitmap) bundle.getParcelable(DecodeThread.BARCODE_BITMAP);
        
          //JANコード情報、画像
          activity.handleDecode((Result) message.obj, barcode);
          break;
      case R.id.decode_failed:
	      // We're decoding as fast as possible, so when one decode fails, start another.
	      state = State.PREVIEW;
	      CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
	      break;
      case R.id.return_scan_result:
          Log.d(TAG, "Got return scan result message");
          activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
          activity.finish();
          break;
      case R.id.launch_product_query:
          Log.d(TAG, "Got product query message");
          String url = (String) message.obj;
          Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
          intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
          activity.startActivity(intent);
          break;
    }
  }

  /**
   * プレービューを閉じる
   * */
  public void quitSynchronously() {
	
    state = State.DONE;
    
    CameraManager.get().stopPreview();
    
    Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
    
    quit.sendToTarget();
    
    try {
      decodeThread.join();
    } catch (InterruptedException e) {
      Log.e("CaptureActivityHandler", "quitSynchronously");
    }
    
    // Be absolutely sure we don't send any queued up messages
    removeMessages(R.id.decode_succeeded);
    removeMessages(R.id.decode_failed);
  }
  
  /**
   * プレービューのコールバックを設置する、オートフォーカス等
   * */
  private void restartPreviewAndDecode() {
	 
    if (state == State.SUCCESS) {
    	
      state = State.PREVIEW;
      
      //コールバック情報のプレービュー
      CameraManager.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
      
      //オートフォーカス
      CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
      
      activity.drawViewfinder();
    }
  }

}
